The readme is amusing - the author expected you to send him $5 for the next update of the level, and he gives out the home address of his friend, which wouldn't happen nowadays. I believe the author intended this as a hybrid deathmatch/co-op level, with himself as the "boss monster". It's not very good; simple angular design, not much ammo, lots of imps and lost souls, one or two simple architecture bits. Slightly better than bog standard 1994.